automatic reverse and forwarding zones

[Andrew Latham]

IRC for example will check for PTR and gate login. I know there are others
but that came to mind quickly. In some regions having PTRs was a
requirement. It has been years but I recall LACNIC required/desired PTRs be
set.

On Thu, Oct 27, 2022 at 2:47 PM Grant Taylor via bind-users <
bind-users at lists.isc.org> wrote:

> On 10/27/22 1:24 PM, Marco wrote:
> > At least for IPv4, there are servers that reject connections from
> > IPs that don't have a reverse zone with PTR record.
>
> Please elaborate.
>
> I've not heard of (unspecified type of) servers rejecting connections
> because of the lack of a PTR record.
>
> I have heard of mail servers /accepting/ a /TCP/ /transport/ connection
> layer but /rejecting/ email at the /SMTP/ /application/ layer for the
> lack of a PTR record.
>
> IMHO mail servers are not in scope for a $GENERATE style flood filling
> of a zone.  Rather they are in scope for very specifically generated
> AAAA records.
>
> > That is the only reason that I see for that.
> > Most ISPs do it.
>
> I'd say that /many/ ISPs populate in-addr.arpa zone(s) for IPv4.  --  I
> still run across IPv4 addresses that don't have PTR records way more
> often than I think is reasonable.
>
> I've seen no evidence that ISPs also populate ip6.arpa zone(s) for IPv6
> in a similar way.  Not the least of which are some of the reasons called
> out in this thread.
>
>
>
> --
> Grant. . . .
> unix || die
>
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-- 
- Andrew "lathama" Latham -
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